bebops, but use the cleats backwards with the narrow side to the inside and wide side to the outer, unlike what the manual suggests.

TIME ATAC might also be a good candidate if you angle the cleat enough.

speedplay frogs only allow heel out and practically none inwards.

one problem I find with clipless systems that allow a lot of float is that you have to twist your heel out really far to get it to unclip, which can be uncomfortable.